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IWR6843ISK: Radome design

JINHYEONG LEE
Intellectual 740 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843, IWR1642,

Hi,

I'm working on design of radome for both IWR6843 and IWR1642

I refer TI document(spracg5).

Q1. As a result of the search, it was confirmed that the center frequency was used.

Can I use the center frequency of the frequency width I use for radome calculations?

(ex, my configuration of bandwidth is 2GHz at IWR6843, than f = 61GHz)

 

Q2. Polycarbonate or Teflon are being considered as radome materials, but their dielectric constant can't be found at 60 GHz and 77 GHz.

Can I get the dielectric constant of polycarbonate and teflon at 60 GHz and 77GHz?

 

Q3. I know Rectangular radomes can have losses in directions other than the boresight. Is there a formula to find out how much this loss is?

 

Q4. Where is the boresight of radar? Is the Tx antenna the reference or the middle of the whole antenna?

 

Q5. Can I get references for designing a curved (half spherical) based radome to reduce losses?

  

Thanks.

  • +1
    TI__Expert 4160 points

    Q1. As a result of the search, it was confirmed that the center frequency was used.

    Can I use the center frequency of the frequency width I use for radome calculations?

    (ex, my configuration of bandwidth is 2GHz at IWR6843, than f = 61GHz)

    A1: Yes

    Q2. Polycarbonate or Teflon are being considered as radome materials, but their dielectric constant can't be found at 60 GHz and 77 GHz.

    Can I get the dielectric constant of polycarbonate and teflon at 60 GHz and 77GHz?

    A2: You need to check with your vendor to get the accurate dielectric constant for the Radome you will be using.  The table below is a good reference.

    Q3. I know Rectangular radomes can have losses in directions other than the boresight. Is there a formula to find out how much this loss is?

     A3:  I would recommend running HFSS simulation to see the difference in losses between rectangular and spherical shaped Radome.

    Q4. Where is the boresight of radar? Is the Tx antenna the reference or the middle of the whole antenna?

    A4: The middle of the whole antennas

     Q5: Can I get references for designing a curved (half spherical) based radome to reduce losses?

    A5: What are looking for here?  Can you be more specific?

    Regards,

    Sami

  • 0 in reply to Sami Mardini
    Intellectual 740 points

    Thank you for reply. It is helpful.

      

    Let me explain the current situation.

    I am contemplating a Rectangular or curved(half spherical) shape when designing a radome. If the loss of the Rectangular radome is not large, a Rectangular radome is being considered because of the convenience of manufacturing. Unfortunately, there is no HFSS simulator, so the extent of the loss is unknown.
    Can you advise on this?

    Thanks.

  • 0 in reply to Sami Mardini
    Intellectual 740 points

    Any update? Antenna uses the antenna pattern of the IWR6843ISK.

  • 0
    TI__Expert 4160 points

    Hi Jinhueong,

    The loss thru the Radome is covered by the highlighted equation below:

    Regards,

    Sami

  • +1 in reply to JINHYEONG LEE
    TI__Expert 4160 points

    Hi Jinhueong,

    The loss thru the Radome is covered by the highlighted equation below:

    But, It would be hard to calculate your design losses using this equation.  So, I would highly recommend getting an HFSS simulator to validate your design.

    Regards,

    Sami